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nface="宋体">碳：美国AISI H13nface="宋体">，nface="Arial">UNS T20813nface="宋体">，nface="Arial">ASTMnface="宋体">（*版）的nface="Arial">H13nface="宋体">和nface="Arial">FED QQ-T-570nface="宋体">的nface="Arial">H13nface="宋体">钢的含碳量都规定为（nface="Arial">0.32~0.45nface="宋体">）nface="Arial">%nface="宋体">，是所有nface="Arial">H13nface="宋体">钢中含碳量范围最宽的。德国nface="Arial">X40CrMoV5-1nface="宋体">和nface="Arial">1.2344nface="宋体">的含碳量为（nface="Arial">0.37~0.43nface="宋体">）nface="Arial">%nface="宋体">，含碳量范围较窄，德国nface="Arial">DIN17350nface="宋体">中还有nface="Arial">X38CrMoV5-1nface="宋体">的含碳量为（nface="Arial">0.36~0.42nface="宋体">）nface="Arial">%nface="宋体">。日本nface="Arial">SKD 61nface="宋体">的含碳量为（nface="Arial">0.32~0.42nface="宋体">）nface="Arial">%nface="宋体">。我国nface="Arial">GB/T 1299nface="宋体">和nface="Arial">YB/T 094nface="宋体">中nface="Arial">4Cr5MoSiV1nface="宋体">和nface="Arial">SM 4Cr5MoSiV1nface="宋体">的含碳量为（nface="Arial">0.32~0.42nface="宋体">）nface="Arial">%nface="宋体">和（nface="Arial">0.32~0.45nface="宋体">）nface="Arial">%nface="宋体">，分别与nface="Arial">SKD61nface="宋体">和nface="Arial">AISI H13nface="宋体">相同。特别要指出的是：北美压铸协会nface="Arial">NADCA 207-90nface="宋体">、nface="Arial">207-97nface="宋体">和nface="Arial">207-2003nface="宋体">标准中对nface="Arial">H13nface="宋体">钢的含碳量都规定为（nface="Arial">0.37~0.42nface="宋体">）nface="Arial">%nface="宋体">。
